Andrew's git - gitweb.git/blob

   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6#ifndef FLEX_ARRAY
   7/*
   8 * See if our compiler is known to support flexible array members.
   9 */
  10#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  11# define FLEX_ARRAY /* empty */
  12#elif defined(__GNUC__)
  13# if (__GNUC__ >= 3)
  14#  define FLEX_ARRAY /* empty */
  15# else
  16#  define FLEX_ARRAY 0 /* older GNU extension */
  17# endif
  18#endif
  19
  20/*
  21 * Otherwise, default to safer but a bit wasteful traditional style
  22 */
  23#ifndef FLEX_ARRAY
  24# define FLEX_ARRAY 1
  25#endif
  26#endif
  27
  28#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  29#define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  30
  31#define maximum_signed_value_of_type(a) \
  32    (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  33
  34#define maximum_unsigned_value_of_type(a) \
  35    (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  36
  37/*
  38 * Signed integer overflow is undefined in C, so here's a helper macro
  39 * to detect if the sum of two integers will overflow.
  40 *
  41 * Requires: a >= 0, typeof(a) equals typeof(b)
  42 */
  43#define signed_add_overflows(a, b) \
  44    ((b) > maximum_signed_value_of_type(a) - (a))
  45
  46#define unsigned_add_overflows(a, b) \
  47    ((b) > maximum_unsigned_value_of_type(a) - (a))
  48
  49#ifdef __GNUC__
  50#define TYPEOF(x) (__typeof__(x))
  51#else
  52#define TYPEOF(x)
  53#endif
  54
  55#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
  56#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  57
  58#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  59
  60/* Approximation of the length of the decimal representation of this type. */
  61#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  62
  63#if defined(__sun__)
  64 /*
  65  * On Solaris, when _XOPEN_EXTENDED is set, its header file
  66  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
  67  * setting to say we are XPG5 or XPG6.  Also on Solaris,
  68  * XPG6 programs must be compiled with a c99 compiler, while
  69  * non XPG6 programs must be compiled with a pre-c99 compiler.
  70  */
  71# if __STDC_VERSION__ - 0 >= 199901L
  72# define _XOPEN_SOURCE 600
  73# else
  74# define _XOPEN_SOURCE 500
  75# endif
  76#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
  77      !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
  78      !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
  79      !defined(__CYGWIN__)
  80#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  81#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  82#endif
  83#define _ALL_SOURCE 1
  84#define _GNU_SOURCE 1
  85#define _BSD_SOURCE 1
  86#define _DEFAULT_SOURCE 1
  87#define _NETBSD_SOURCE 1
  88#define _SGI_SOURCE 1
  89
  90#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  91# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
  92#  define _WIN32_WINNT 0x0502
  93# endif
  94#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  95#include <winsock2.h>
  96#include <windows.h>
  97#define GIT_WINDOWS_NATIVE
  98#endif
  99
 100#include <unistd.h>
 101#include <stdio.h>
 102#include <sys/stat.h>
 103#include <fcntl.h>
 104#include <stddef.h>
 105#include <stdlib.h>
 106#include <stdarg.h>
 107#include <string.h>
 108#ifdef HAVE_STRINGS_H
 109#include <strings.h> /* for strcasecmp() */
 110#endif
 111#include <errno.h>
 112#include <limits.h>
 113#ifdef NEEDS_SYS_PARAM_H
 114#include <sys/param.h>
 115#endif
 116#include <sys/types.h>
 117#include <dirent.h>
 118#include <sys/time.h>
 119#include <time.h>
 120#include <signal.h>
 121#include <assert.h>
 122#include <regex.h>
 123#include <utime.h>
 124#include <syslog.h>
 125#ifndef NO_SYS_POLL_H
 126#include <sys/poll.h>
 127#else
 128#include <poll.h>
 129#endif
 130
 131#if defined(__MINGW32__)
 132/* pull in Windows compatibility stuff */
 133#include "compat/mingw.h"
 134#elif defined(_MSC_VER)
 135#include "compat/msvc.h"
 136#else
 137#include <sys/wait.h>
 138#include <sys/resource.h>
 139#include <sys/socket.h>
 140#include <sys/ioctl.h>
 141#include <termios.h>
 142#ifndef NO_SYS_SELECT_H
 143#include <sys/select.h>
 144#endif
 145#include <netinet/in.h>
 146#include <netinet/tcp.h>
 147#include <arpa/inet.h>
 148#include <netdb.h>
 149#include <pwd.h>
 150#include <sys/un.h>
 151#ifndef NO_INTTYPES_H
 152#include <inttypes.h>
 153#else
 154#include <stdint.h>
 155#endif
 156#ifdef NO_INTPTR_T
 157/*
 158 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 159 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 160 * while on IP16 and IP16L32 it is "int" (resp. "short")
 161 * Size needs to match (or exceed) 'sizeof(void *)'.
 162 * We can't take "long long" here as not everybody has it.
 163 */
 164typedef long intptr_t;
 165typedef unsigned long uintptr_t;
 166#endif
 167#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 168#include <grp.h>
 169#define _ALL_SOURCE 1
 170#endif
 171
 172/* used on Mac OS X */
 173#ifdef PRECOMPOSE_UNICODE
 174#include "compat/precompose_utf8.h"
 175#else
 176#define precompose_str(in,i_nfd2nfc)
 177#define precompose_argv(c,v)
 178#define probe_utf8_pathname_composition(a,b)
 179#endif
 180
 181#ifdef MKDIR_WO_TRAILING_SLASH
 182#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 183extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 184#endif
 185
 186#ifdef NO_STRUCT_ITIMERVAL
 187struct itimerval {
 188        struct timeval it_interval;
 189        struct timeval it_value;
 190};
 191#endif
 192
 193#ifdef NO_SETITIMER
 194#define setitimer(which,value,ovalue)
 195#endif
 196
 197#ifndef NO_LIBGEN_H
 198#include <libgen.h>
 199#else
 200#define basename gitbasename
 201extern char *gitbasename(char *);
 202#endif
 203
 204#ifndef NO_ICONV
 205#include <iconv.h>
 206#endif
 207
 208#ifndef NO_OPENSSL
 209#ifdef __APPLE__
 210#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 211#include <AvailabilityMacros.h>
 212#undef DEPRECATED_ATTRIBUTE
 213#define DEPRECATED_ATTRIBUTE
 214#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 215#endif
 216#include <openssl/ssl.h>
 217#include <openssl/err.h>
 218#ifdef NO_HMAC_CTX_CLEANUP
 219#define HMAC_CTX_cleanup HMAC_cleanup
 220#endif
 221#endif
 222
 223/* On most systems <netdb.h> would have given us this, but
 224 * not on some systems (e.g. z/OS).
 225 */
 226#ifndef NI_MAXHOST
 227#define NI_MAXHOST 1025
 228#endif
 229
 230#ifndef NI_MAXSERV
 231#define NI_MAXSERV 32
 232#endif
 233
 234/* On most systems <limits.h> would have given us this, but
 235 * not on some systems (e.g. GNU/Hurd).
 236 */
 237#ifndef PATH_MAX
 238#define PATH_MAX 4096
 239#endif
 240
 241#ifndef PRIuMAX
 242#define PRIuMAX "llu"
 243#endif
 244
 245#ifndef PRIu32
 246#define PRIu32 "u"
 247#endif
 248
 249#ifndef PRIx32
 250#define PRIx32 "x"
 251#endif
 252
 253#ifndef PRIo32
 254#define PRIo32 "o"
 255#endif
 256
 257#ifndef PATH_SEP
 258#define PATH_SEP ':'
 259#endif
 260
 261#ifdef HAVE_PATHS_H
 262#include <paths.h>
 263#endif
 264#ifndef _PATH_DEFPATH
 265#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 266#endif
 267
 268#ifndef STRIP_EXTENSION
 269#define STRIP_EXTENSION ""
 270#endif
 271
 272#ifndef has_dos_drive_prefix
 273static inline int git_has_dos_drive_prefix(const char *path)
 274{
 275        return 0;
 276}
 277#define has_dos_drive_prefix git_has_dos_drive_prefix
 278#endif
 279
 280#ifndef is_dir_sep
 281static inline int git_is_dir_sep(int c)
 282{
 283        return c == '/';
 284}
 285#define is_dir_sep git_is_dir_sep
 286#endif
 287
 288#ifndef offset_1st_component
 289static inline int git_offset_1st_component(const char *path)
 290{
 291        return is_dir_sep(path[0]);
 292}
 293#define offset_1st_component git_offset_1st_component
 294#endif
 295
 296#ifndef find_last_dir_sep
 297static inline char *git_find_last_dir_sep(const char *path)
 298{
 299        return strrchr(path, '/');
 300}
 301#define find_last_dir_sep git_find_last_dir_sep
 302#endif
 303
 304#if defined(__HP_cc) && (__HP_cc >= 61000)
 305#define NORETURN __attribute__((noreturn))
 306#define NORETURN_PTR
 307#elif defined(__GNUC__) && !defined(NO_NORETURN)
 308#define NORETURN __attribute__((__noreturn__))
 309#define NORETURN_PTR __attribute__((__noreturn__))
 310#elif defined(_MSC_VER)
 311#define NORETURN __declspec(noreturn)
 312#define NORETURN_PTR
 313#else
 314#define NORETURN
 315#define NORETURN_PTR
 316#ifndef __GNUC__
 317#ifndef __attribute__
 318#define __attribute__(x)
 319#endif
 320#endif
 321#endif
 322
 323/* The sentinel attribute is valid from gcc version 4.0 */
 324#if defined(__GNUC__) && (__GNUC__ >= 4)
 325#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 326#else
 327#define LAST_ARG_MUST_BE_NULL
 328#endif
 329
 330#include "compat/bswap.h"
 331
 332#include "wildmatch.h"
 333
 334struct strbuf;
 335
 336/* General helper functions */
 337extern void vreportf(const char *prefix, const char *err, va_list params);
 338extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 339extern NORETURN void usage(const char *err);
 340extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 341extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 342extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 343extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 344extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 345
 346#ifndef NO_OPENSSL
 347#ifdef APPLE_COMMON_CRYPTO
 348#include "compat/apple-common-crypto.h"
 349#else
 350#include <openssl/evp.h>
 351#include <openssl/hmac.h>
 352#endif /* APPLE_COMMON_CRYPTO */
 353#include <openssl/x509v3.h>
 354#endif /* NO_OPENSSL */
 355
 356/*
 357 * Let callers be aware of the constant return value; this can help
 358 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 359 * because some compilers may not support variadic macros. Since we're only
 360 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 361 * using the function as usual.
 362 */
 363#if defined(__GNUC__)
 364static inline int const_error(void)
 365{
 366        return -1;
 367}
 368#define error(...) (error(__VA_ARGS__), const_error())
 369#endif
 370
 371extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 372extern void set_error_routine(void (*routine)(const char *err, va_list params));
 373extern void set_die_is_recursing_routine(int (*routine)(void));
 374
 375extern int starts_with(const char *str, const char *prefix);
 376
 377/*
 378 * If the string "str" begins with the string found in "prefix", return 1.
 379 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 380 * the string right after the prefix).
 381 *
 382 * Otherwise, return 0 and leave "out" untouched.
 383 *
 384 * Examples:
 385 *
 386 *   [extract branch name, fail if not a branch]
 387 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 388 *      return -1;
 389 *
 390 *   [skip prefix if present, otherwise use whole string]
 391 *   skip_prefix(name, "refs/heads/", &name);
 392 */
 393static inline int skip_prefix(const char *str, const char *prefix,
 394                              const char **out)
 395{
 396        do {
 397                if (!*prefix) {
 398                        *out = str;
 399                        return 1;
 400                }
 401        } while (*str++ == *prefix++);
 402        return 0;
 403}
 404
 405/*
 406 * If buf ends with suffix, return 1 and subtract the length of the suffix
 407 * from *len. Otherwise, return 0 and leave *len untouched.
 408 */
 409static inline int strip_suffix_mem(const char *buf, size_t *len,
 410                                   const char *suffix)
 411{
 412        size_t suflen = strlen(suffix);
 413        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 414                return 0;
 415        *len -= suflen;
 416        return 1;
 417}
 418
 419/*
 420 * If str ends with suffix, return 1 and set *len to the size of the string
 421 * without the suffix. Otherwise, return 0 and set *len to the size of the
 422 * string.
 423 *
 424 * Note that we do _not_ NUL-terminate str to the new length.
 425 */
 426static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 427{
 428        *len = strlen(str);
 429        return strip_suffix_mem(str, len, suffix);
 430}
 431
 432static inline int ends_with(const char *str, const char *suffix)
 433{
 434        size_t len;
 435        return strip_suffix(str, suffix, &len);
 436}
 437
 438#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 439
 440#ifndef PROT_READ
 441#define PROT_READ 1
 442#define PROT_WRITE 2
 443#define MAP_PRIVATE 1
 444#endif
 445
 446#define mmap git_mmap
 447#define munmap git_munmap
 448extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 449extern int git_munmap(void *start, size_t length);
 450
 451#else /* NO_MMAP || USE_WIN32_MMAP */
 452
 453#include <sys/mman.h>
 454
 455#endif /* NO_MMAP || USE_WIN32_MMAP */
 456
 457#ifdef NO_MMAP
 458
 459/* This value must be multiple of (pagesize * 2) */
 460#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 461
 462#else /* NO_MMAP */
 463
 464/* This value must be multiple of (pagesize * 2) */
 465#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 466        (sizeof(void*) >= 8 \
 467                ?  1 * 1024 * 1024 * 1024 \
 468                : 32 * 1024 * 1024)
 469
 470#endif /* NO_MMAP */
 471
 472#ifndef MAP_FAILED
 473#define MAP_FAILED ((void *)-1)
 474#endif
 475
 476#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 477#define on_disk_bytes(st) ((st).st_size)
 478#else
 479#define on_disk_bytes(st) ((st).st_blocks * 512)
 480#endif
 481
 482#ifdef NEEDS_MODE_TRANSLATION
 483#undef S_IFMT
 484#undef S_IFREG
 485#undef S_IFDIR
 486#undef S_IFLNK
 487#undef S_IFBLK
 488#undef S_IFCHR
 489#undef S_IFIFO
 490#undef S_IFSOCK
 491#define S_IFMT   0170000
 492#define S_IFREG  0100000
 493#define S_IFDIR  0040000
 494#define S_IFLNK  0120000
 495#define S_IFBLK  0060000
 496#define S_IFCHR  0020000
 497#define S_IFIFO  0010000
 498#define S_IFSOCK 0140000
 499#ifdef stat
 500#undef stat
 501#endif
 502#define stat(path, buf) git_stat(path, buf)
 503extern int git_stat(const char *, struct stat *);
 504#ifdef fstat
 505#undef fstat
 506#endif
 507#define fstat(fd, buf) git_fstat(fd, buf)
 508extern int git_fstat(int, struct stat *);
 509#ifdef lstat
 510#undef lstat
 511#endif
 512#define lstat(path, buf) git_lstat(path, buf)
 513extern int git_lstat(const char *, struct stat *);
 514#endif
 515
 516#define DEFAULT_PACKED_GIT_LIMIT \
 517        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 518
 519#ifdef NO_PREAD
 520#define pread git_pread
 521extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 522#endif
 523/*
 524 * Forward decl that will remind us if its twin in cache.h changes.
 525 * This function is used in compat/pread.c.  But we can't include
 526 * cache.h there.
 527 */
 528extern ssize_t read_in_full(int fd, void *buf, size_t count);
 529
 530#ifdef NO_SETENV
 531#define setenv gitsetenv
 532extern int gitsetenv(const char *, const char *, int);
 533#endif
 534
 535#ifdef NO_MKDTEMP
 536#define mkdtemp gitmkdtemp
 537extern char *gitmkdtemp(char *);
 538#endif
 539
 540#ifdef NO_MKSTEMPS
 541#define mkstemps gitmkstemps
 542extern int gitmkstemps(char *, int);
 543#endif
 544
 545#ifdef NO_UNSETENV
 546#define unsetenv gitunsetenv
 547extern void gitunsetenv(const char *);
 548#endif
 549
 550#ifdef NO_STRCASESTR
 551#define strcasestr gitstrcasestr
 552extern char *gitstrcasestr(const char *haystack, const char *needle);
 553#endif
 554
 555#ifdef NO_STRLCPY
 556#define strlcpy gitstrlcpy
 557extern size_t gitstrlcpy(char *, const char *, size_t);
 558#endif
 559
 560#ifdef NO_STRTOUMAX
 561#define strtoumax gitstrtoumax
 562extern uintmax_t gitstrtoumax(const char *, char **, int);
 563#define strtoimax gitstrtoimax
 564extern intmax_t gitstrtoimax(const char *, char **, int);
 565#endif
 566
 567#ifdef NO_HSTRERROR
 568#define hstrerror githstrerror
 569extern const char *githstrerror(int herror);
 570#endif
 571
 572#ifdef NO_MEMMEM
 573#define memmem gitmemmem
 574void *gitmemmem(const void *haystack, size_t haystacklen,
 575                const void *needle, size_t needlelen);
 576#endif
 577
 578#ifdef NO_GETPAGESIZE
 579#define getpagesize() sysconf(_SC_PAGESIZE)
 580#endif
 581
 582#ifdef FREAD_READS_DIRECTORIES
 583#ifdef fopen
 584#undef fopen
 585#endif
 586#define fopen(a,b) git_fopen(a,b)
 587extern FILE *git_fopen(const char*, const char*);
 588#endif
 589
 590#ifdef SNPRINTF_RETURNS_BOGUS
 591#ifdef snprintf
 592#undef snprintf
 593#endif
 594#define snprintf git_snprintf
 595extern int git_snprintf(char *str, size_t maxsize,
 596                        const char *format, ...);
 597#ifdef vsnprintf
 598#undef vsnprintf
 599#endif
 600#define vsnprintf git_vsnprintf
 601extern int git_vsnprintf(char *str, size_t maxsize,
 602                         const char *format, va_list ap);
 603#endif
 604
 605#ifdef __GLIBC_PREREQ
 606#if __GLIBC_PREREQ(2, 1)
 607#define HAVE_STRCHRNUL
 608#define HAVE_MEMPCPY
 609#endif
 610#endif
 611
 612#ifndef HAVE_STRCHRNUL
 613#define strchrnul gitstrchrnul
 614static inline char *gitstrchrnul(const char *s, int c)
 615{
 616        while (*s && *s != c)
 617                s++;
 618        return (char *)s;
 619}
 620#endif
 621
 622#ifndef HAVE_MEMPCPY
 623#define mempcpy gitmempcpy
 624static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 625{
 626        return (char *)memcpy(dest, src, n) + n;
 627}
 628#endif
 629
 630#ifdef NO_INET_PTON
 631int inet_pton(int af, const char *src, void *dst);
 632#endif
 633
 634#ifdef NO_INET_NTOP
 635const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 636#endif
 637
 638#ifdef NO_PTHREADS
 639#define atexit git_atexit
 640extern int git_atexit(void (*handler)(void));
 641#endif
 642
 643extern void release_pack_memory(size_t);
 644
 645typedef void (*try_to_free_t)(size_t);
 646extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 647
 648#ifdef HAVE_ALLOCA_H
 649# include <alloca.h>
 650# define xalloca(size)      (alloca(size))
 651# define xalloca_free(p)    do {} while (0)
 652#else
 653# define xalloca(size)      (xmalloc(size))
 654# define xalloca_free(p)    (free(p))
 655#endif
 656extern char *xstrdup(const char *str);
 657extern void *xmalloc(size_t size);
 658extern void *xmallocz(size_t size);
 659extern void *xmallocz_gently(size_t size);
 660extern void *xmemdupz(const void *data, size_t len);
 661extern char *xstrndup(const char *str, size_t len);
 662extern void *xrealloc(void *ptr, size_t size);
 663extern void *xcalloc(size_t nmemb, size_t size);
 664extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 665extern ssize_t xread(int fd, void *buf, size_t len);
 666extern ssize_t xwrite(int fd, const void *buf, size_t len);
 667extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 668extern int xdup(int fd);
 669extern FILE *xfdopen(int fd, const char *mode);
 670extern int xmkstemp(char *template);
 671extern int xmkstemp_mode(char *template, int mode);
 672extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 673extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 674extern char *xgetcwd(void);
 675
 676#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 677
 678static inline char *xstrdup_or_null(const char *str)
 679{
 680        return str ? xstrdup(str) : NULL;
 681}
 682
 683static inline size_t xsize_t(off_t len)
 684{
 685        if (len > (size_t) len)
 686                die("Cannot handle files this big");
 687        return (size_t)len;
 688}
 689
 690/* in ctype.c, for kwset users */
 691extern const unsigned char tolower_trans_tbl[256];
 692
 693/* Sane ctype - no locale, and works with signed chars */
 694#undef isascii
 695#undef isspace
 696#undef isdigit
 697#undef isalpha
 698#undef isalnum
 699#undef isprint
 700#undef islower
 701#undef isupper
 702#undef tolower
 703#undef toupper
 704#undef iscntrl
 705#undef ispunct
 706#undef isxdigit
 707
 708extern const unsigned char sane_ctype[256];
 709#define GIT_SPACE 0x01
 710#define GIT_DIGIT 0x02
 711#define GIT_ALPHA 0x04
 712#define GIT_GLOB_SPECIAL 0x08
 713#define GIT_REGEX_SPECIAL 0x10
 714#define GIT_PATHSPEC_MAGIC 0x20
 715#define GIT_CNTRL 0x40
 716#define GIT_PUNCT 0x80
 717#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 718#define isascii(x) (((x) & ~0x7f) == 0)
 719#define isspace(x) sane_istest(x,GIT_SPACE)
 720#define isdigit(x) sane_istest(x,GIT_DIGIT)
 721#define isalpha(x) sane_istest(x,GIT_ALPHA)
 722#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 723#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 724#define islower(x) sane_iscase(x, 1)
 725#define isupper(x) sane_iscase(x, 0)
 726#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 727#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 728#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 729#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 730                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 731#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 732#define tolower(x) sane_case((unsigned char)(x), 0x20)
 733#define toupper(x) sane_case((unsigned char)(x), 0)
 734#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 735
 736static inline int sane_case(int x, int high)
 737{
 738        if (sane_istest(x, GIT_ALPHA))
 739                x = (x & ~0x20) | high;
 740        return x;
 741}
 742
 743static inline int sane_iscase(int x, int is_lower)
 744{
 745        if (!sane_istest(x, GIT_ALPHA))
 746                return 0;
 747
 748        if (is_lower)
 749                return (x & 0x20) != 0;
 750        else
 751                return (x & 0x20) == 0;
 752}
 753
 754static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 755{
 756        unsigned long ul;
 757        char *p;
 758
 759        errno = 0;
 760        ul = strtoul(s, &p, base);
 761        if (errno || *p || p == s || (unsigned int) ul != ul)
 762                return -1;
 763        *result = ul;
 764        return 0;
 765}
 766
 767static inline int strtol_i(char const *s, int base, int *result)
 768{
 769        long ul;
 770        char *p;
 771
 772        errno = 0;
 773        ul = strtol(s, &p, base);
 774        if (errno || *p || p == s || (int) ul != ul)
 775                return -1;
 776        *result = ul;
 777        return 0;
 778}
 779
 780#ifdef INTERNAL_QSORT
 781void git_qsort(void *base, size_t nmemb, size_t size,
 782               int(*compar)(const void *, const void *));
 783#define qsort git_qsort
 784#endif
 785
 786#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 787# define FORCE_DIR_SET_GID S_ISGID
 788#else
 789# define FORCE_DIR_SET_GID 0
 790#endif
 791
 792#ifdef NO_NSEC
 793#undef USE_NSEC
 794#define ST_CTIME_NSEC(st) 0
 795#define ST_MTIME_NSEC(st) 0
 796#else
 797#ifdef USE_ST_TIMESPEC
 798#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 799#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 800#else
 801#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 802#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 803#endif
 804#endif
 805
 806#ifdef UNRELIABLE_FSTAT
 807#define fstat_is_reliable() 0
 808#else
 809#define fstat_is_reliable() 1
 810#endif
 811
 812#ifndef va_copy
 813/*
 814 * Since an obvious implementation of va_list would be to make it a
 815 * pointer into the stack frame, a simple assignment will work on
 816 * many systems.  But let's try to be more portable.
 817 */
 818#ifdef __va_copy
 819#define va_copy(dst, src) __va_copy(dst, src)
 820#else
 821#define va_copy(dst, src) ((dst) = (src))
 822#endif
 823#endif
 824
 825#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 826#define HAVE_VARIADIC_MACROS 1
 827#endif
 828
 829/*
 830 * Preserves errno, prints a message, but gives no warning for ENOENT.
 831 * Returns 0 on success, which includes trying to unlink an object that does
 832 * not exist.
 833 */
 834int unlink_or_warn(const char *path);
 835 /*
 836  * Tries to unlink file.  Returns 0 if unlink succeeded
 837  * or the file already didn't exist.  Returns -1 and
 838  * appends a message to err suitable for
 839  * 'error("%s", err->buf)' on error.
 840  */
 841int unlink_or_msg(const char *file, struct strbuf *err);
 842/*
 843 * Preserves errno, prints a message, but gives no warning for ENOENT.
 844 * Returns 0 on success, which includes trying to remove a directory that does
 845 * not exist.
 846 */
 847int rmdir_or_warn(const char *path);
 848/*
 849 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 850 * the supplied file mode.
 851 */
 852int remove_or_warn(unsigned int mode, const char *path);
 853
 854/*
 855 * Call access(2), but warn for any error except "missing file"
 856 * (ENOENT or ENOTDIR).
 857 */
 858#define ACCESS_EACCES_OK (1U << 0)
 859int access_or_warn(const char *path, int mode, unsigned flag);
 860int access_or_die(const char *path, int mode, unsigned flag);
 861
 862/* Warn on an inaccessible file that ought to be accessible */
 863void warn_on_inaccessible(const char *path);
 864
 865/* Get the passwd entry for the UID of the current process. */
 866struct passwd *xgetpwuid_self(void);
 867
 868#ifdef GMTIME_UNRELIABLE_ERRORS
 869struct tm *git_gmtime(const time_t *);
 870struct tm *git_gmtime_r(const time_t *, struct tm *);
 871#define gmtime git_gmtime
 872#define gmtime_r git_gmtime_r
 873#endif
 874
 875#endif